/in/foo.c: In function 'main':
/in/foo.c:7:2: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'scanf'
  scanf("%d%d",&a,&b);
  ^
/in/foo.c:7:19: error: 'b' undeclared (first use in this function)
  scanf("%d%d",&a,&b);
                   ^
/in/foo.c:7:19: note: each undeclared identifier is reported only once for each function it appears in